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2.3 SERVICING
2.3.1 Cylinder Head And Valves
1. Red Dye
2. Deter
g
ent
3. White Developer
2.3.1.a Cylinder Head Surface Flatness
1. Clean the cylinder head surface.
2. Place a straightedge on the cylinder head surface, in
six locations as depicted in the drawing.
3. Measure any clearance between the straightedge
and cylinder head with a feeler gauge.
4. If the measurement exceeds the allowable limit,
resurface or replace the head.
NOTE
Check the valve recessing after after resurfac-
ing the head.
Cylinder Head
Surface Flatness
Factory
Specification
0.05mm over a span of
500mm
0.002 in. over a span of
20 in.
2.3.1.b Cylinder Head Cracks
1. Cylinder head crack(s) can b e found with using a
non--destructive test procedure using a dye/pene-
trant kit.
2. Clean the cylinder head surface using a good quality
degreaser and detergent (2).
3. Spray the cylinder head surface wit h the red liquid or
dye (1). Let it sit on the surface for ten minutes.
4. Wash the dye off the headusing the detergent (2)and
dry the head.
5. Spray the white developer (3) on to the head.
6. Red marks will bleed through the developer identify-
ing cracks in the head if they are present.